Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6755480 | Drum-type dual channel water-jet assisted cutting head | Jeffrey J. Schwoebel | 2004-06-29 |
| 6612655 | Mining system and method featuring a bread loaf shaped borehole | Jeffrey J. Schwoebel, Rudy Paul Zych, Jerry O'Keefe, George Coleman | 2003-09-02 |
| 6409276 | Water-jet assisted drum-type mining system | Jeffrey J. Schwoebel | 2002-06-25 |
| 6293628 | Hydraulic scroll auger mining system and method of using the same | Jeffrey J. Schwoebel, William J. Peters | 2001-09-25 |